Abstract: A composite light guiding member includes light sources, a light guide plate, and a light source substrate that is flexible. The light source substrate includes a switching circuit, amounting surface, and a flexible curved section. The switching circuit is configured to control turn-on and turn-off of the light sources. The light source substrate includes a first side edge and a second side edge fixed to a first plate surface and a second plate surface of the light guide plate, respectively. The light sources are arranged along the first side edge and mounted on the mounting surface between the first side edge and the second side edge. The flexible curved section includes the mounting surface. The flexible curved section is folded so that the light sources are opposed to a light entering surface of the light guide plate and displaceable relative to the light entering surface.